1. ‘Determination of plane strain fracture toughness with sharply notched sheets’;Boyle;Welding Journal,1962
2. The incidence of Pop-ins in fracture toughness testing;Kamath;The Welding Institute Res. Bull.,1979
3. ASTM E399-70T; “Tentative method of test for plane strain fracture toughness of metallic materials”, (1970)
4. Quantifying Pop-In Severity in Fracture Toughness Tests;Dawes;Fatigue Fract. Engng. Mater. Strurt.,1991
5. British Standards Institution, Methods for Plane Strain Fracture Toughness, (KIC) Testing, DD3 (1972)